Michael T. Flynn, the national security adviser, resigned on Monday night after it was revealed that he had misled Vice President Mike Pence and other top White House officials about his conversations with the Russian ambassador to the United States.
Mr. Flynn, who served in the job for less than a month, said he had given “incomplete information” to about a telephone call he had with the ambassador in late December about American sanctions against Russia, weeks before Mr. Trump’s inauguration. Mr. Flynn previously had denied that he had any substantive conversations with Ambassador Sergey I. Kislyak, and Mr. Pence repeated